linux-kernel - Re: [BUG] slub crashes on dma allocations

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Date:	Thu, 27 May 2010 09:17:17 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [BUG] slub crashes on dma allocations


So S390 has NUMA and the minalign is allowing very small slabs of 8/16/32 bytes?


Try this patch

From: Christoph Lameter <cl@...ux-foundation.org>
Subject: SLUB: Allow full duplication of kmalloc array for 390

Seems that S390 is running out of kmalloc caches.

Increase the number of kmalloc caches to a safe size.

Signed-off-by: Christoph Lameter <cl@...ux-foundation.org>

---
 include/linux/slub_def.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/include/linux/slub_def.h
===================================================================
--- linux-2.6.orig/include/linux/slub_def.h	2010-05-27 09:14:16.000000000 -0500
+++ linux-2.6/include/linux/slub_def.h	2010-05-27 09:14:26.000000000 -0500
@@ -140,7 +140,7 @@ struct kmem_cache {
 #ifdef CONFIG_ZONE_DMA
 #define SLUB_DMA __GFP_DMA
 /* Reserve extra caches for potential DMA use */
-#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT - 6)
+#define KMALLOC_CACHES (2 * SLUB_PAGE_SHIFT)
 #else
 /* Disable DMA functionality */
 #define SLUB_DMA (__force gfp_t)0

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